123020013 has 4 divisors (see below), whose sum is σ = 164026688. Its totient is φ = 82013340.

The previous prime is 123020011. The next prime is 123020047. The reversal of 123020013 is 310020321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 123020013 - 2¹ = 123020011 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123020011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20503333 + ... + 20503338.

It is an arithmetic number, because the mean of its divisors is an integer number (41006672).

Almost surely, 2^123020013 is an apocalyptic number.

It is an amenable number.

123020013 is a deficient number, since it is larger than the sum of its proper divisors (41006675).

123020013 is an equidigital number, since it uses as much as digits as its factorization.

123020013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41006674.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 123020013 is about 11091.4387254314. The cubic root of 123020013 is about 497.3459543433.

Adding to 123020013 its reverse (310020321), we get a palindrome (433040334).

The spelling of 123020013 in words is "one hundred twenty-three million, twenty thousand, thirteen".